---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: valid.js
---
# Input
```jsx
var r = /[👍]/u;
var r = /[\\uD83D\\uDC4D]/u;
var r = /[\\u{1F44D}]/u;
var r = /❇️/;
var r = /Á/;
var r = /[❇]/;
var r = /👶🏻/;
var r = /[👶]/u;
var r = /🇯🇵/;
var r = /[JP]/;
var r = /👨‍👩‍👦/;

// Ignore solo lead/tail surrogate.
var r = /[\\uD83D]/;
var r = /[\\uDC4D]/;
var r = /[\\uD83D]/u;
var r = /[\\uDC4D]/u;

// Ignore solo combining char.
var r = /[\\u0301]/;
var r = /[\\uFE0F]/;
var r = /[\\u0301]/u;
var r = /[\\uFE0F]/u;

// Ignore solo emoji modifier.
var r = /[\\u{1F3FB}]/u;
var r = /[\u{1F3FB}]/u;

// Ignore solo regional indicator symbol.
var r = /[🇯]/u;
var r = /[🇵]/u;

// Ignore solo ZWJ.
var r = /[\\u200D]/;
var r = /[\\u200D]/u;

// don't report and don't crash on invalid regex
// FIXME: need to ecma regex parser to handle this case
// var r = new RegExp('[Á] [ ');
// var r = RegExp('{ [Á]', 'u');
// var r = new globalThis.RegExp('[Á] [ ');
// var r = globalThis.RegExp('{ [Á]', 'u');

// v flag
var r = /[👍]/v;
var r = /^[\q{👶🏻}]$/v;
var r = /[🇯\q{abc}🇵]/v;
var r = /[🇯[A]🇵]/v;
var r = /[🇯[A--B]🇵]/v;

var r = new window.RegExp(/[👍]/u);
var r = new global.RegExp(/[👍]/u);
var r = new globalThis.RegExp(/[👍]/u);
var r = new globalThis.globalThis.globalThis.RegExp(/[👍]/u);

// Issue: https://github.com/biomejs/biome/issues/1522
var cyrillicChars = /[\u200E\u2066-\u2069]/gu;

```